Improve About Window

[n0toose]

Proposal for the About Window:

• Replace "Tenacity 3.0.4-alpha" with simply "Tenacity", we can figure out the versioning stuff later.
• Replace the "Tenacity the free, open source, cross-platform software for recording and editing sounds." because the lack of punctuation doesn't make it look that good.
• Add a new header called "Audacity 3.0.4-alpha" right before the Audacity credits.
• The "Tenacity Team" is a very vague term and it's sort of incomplete. There are members in the organization that have contributed a lot but are not actively affiliated or go on-and-off. We should probably name both "team members" and contributors without making "large" distinctions with titles (because this will get messy as we'll start adding more names). We should show our gratefulness to every contributor, especially since they're helping Tenacity get off its feet too much. We can worry about separating this later on. I guess that's much better than "just listing myself" and being done with it.
• We should probably follow the format of First Name, Last Name (Alias with a hyperlink that leads back to the person's GitHub page or website) and avoid titles for the time being, we can worry about separating this later on (We can just follow the Audacity format, but not now.).

[n0toose]

Alternatively, the names could look like this: First Name "Alias" Last Name (Website, GitHub, something else)

[n0toose]

This is a follow-up of the discussion held here; https://github.com/tenacityteam/tenacity/issues/308#issuecomment-882410498

[n0toose]

Over at @haiku, which I also regularly contribute to, people are allowed to simply add themselves to the credits exactly the way they want (using Git as a source is not always be good enough) and the names have to be sorted alphabetically. Translators are also present in the credits. There's only separation between roles. Something similar is being done in other places like the XFCE desktop environment, as well.

Automatically fetching names would not be useful in the long run, especially if you consider the fact that, say, people can change names on demand or after they get married.

[n0toose]

Also consider: Weblate, Co-authored-by's, cherry-picked commits, commits that were made on behalf of the author of a change.